Helicore strings are praised for their warm, gut-like sound and longevity.

D'Addario's Helicore strings are justifiably popular; they offer a warm, rich sound that's remarkably similar to gut or synthetic core strings. Unlike gut, however, their all-metal construction renders them impervious to fluctuations in humidity and temperature. Helicore strings have a multi-strand high-carbon steel core that produces flexible response and range. The core is overlaid with exotic alloy windings that provide extremely quick bow response and outstanding projection. The end result is a versatile string with very long playing life that is extremely stable under all playing conditions.

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I am a miserable violinist. My tone on the wound strings, when I fingered them,was terrible. I thought that this could be due to my heavy grip causing the pitch to waver in an unpleasant fashion. I ordered the D'Addario Helicore 4/4 Size Heavy Violin Strings from Musician's Friend and installed them on my violin, The heavier strings made all the difference, I can stand my tone now. It is bolder and less tentative. Great strings for a Neanderthal like me.

I've been using the medium tension strings for a couple of years and just decided to try the heavies. I will probably not go back to the mediums after using these strings. They're noticably louder than the mediums and they play much smoother. I feel like I don't have to work as hard to get the right tone.Really nice strings. Noticably louder than the mediums and very well ballanced. The wound E string whistles much less than my previous unwound E.The break in time was nearly nonexistent. They're not overly bouncy and they feel great under my fingers.Great value considering these strings are almost half the price of many other strings like Dominant and Pirastro.